Annual mean 11°C · wettest around May · prevailing wind SW
Warmest
27.7 °C
Coldest
-3.0 °C
Wettest
51%
Windiest
5.9 m/s
Prevailing
SW
4.7 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Naperville over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -5°C. Naperville has no sharply defined rainy season: the chance of rain on a given day runs from 38% in February, the driest month, to 43% in May, the wettest. Winds in Naperville are highest in March, averaging 4.6 m/s (17 km/h), and lightest in August, at 2.7 m/s (10 km/h). The prevailing wind is from the SW. The clearest skies in Naperville come in August, when the sky is typically 41% covered; January is the cloudiest month, at 65%.
Month by month Naperville climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-2°C
-5°C
-8°C
38%
65%
4.3 m/s
0
0
1
February
1°C
-4°C
-5°C
38%
54%
4.4 m/s
1
0
8
March
7°C
1°C
2°C
43%
56%
4.6 m/s
4
0
21
April
13°C
6°C
7°C
40%
55%
4.5 m/s
20
1
46
May
20°C
13°C
16°C
43%
52%
3.9 m/s
51
14
60
June
26°C
19°C
25°C
41%
42%
3.5 m/s
58
41
35
July
27°C
21°C
28°C
41%
41%
2.8 m/s
46
58
16
August
27°C
19°C
27°C
40%
41%
2.7 m/s
53
54
22
September
24°C
16°C
23°C
41%
42%
3.0 m/s
65
33
48
October
16°C
9°C
12°C
42%
50%
3.6 m/s
36
5
60
November
8°C
3°C
2°C
39%
52%
4.0 m/s
7
0
26
December
2°C
-2°C
-4°C
41%
61%
4.1 m/s
0
0
6
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Naperville weather by season
Year round, Naperville has days of about -2°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -5°C to 21°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around May and least likely around February. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Naperville weather in winterDecember to February
High 0°CLow -3°CRain 39%
Winter in Naperville has typical daily highs of about 0°C and lows of about -3°C, with a 39% chance of rain on a given day.
Naperville weather in springMarch to May
High 13°CLow 7°CRain 42%
Spring in Naperville has typical daily highs of about 13°C and lows of about 7°C, with a 42% chance of rain on a given day.
Naperville weather in summerJune to August
High 27°CLow 20°CRain 41%
Summer in Naperville has typical daily highs of about 27°C and lows of about 20°C, with a 41% chance of rain on a given day.
Naperville weather in autumnSeptember to November
High 16°CLow 9°CRain 41%
Autumn in Naperville has typical daily highs of about 16°C and lows of about 9°C, with a 41% chance of rain on a given day.
When is the rainy season in Naperville?
Naperville has no sharply defined rainy season: the chance of rain on a given day runs from 38% in February, the driest month, to 43% in May, the wettest.
What time of year is Naperville windiest?
Winds in Naperville are highest in March, averaging 4.6 m/s (17 km/h), and lightest in August, at 2.7 m/s (10 km/h). The prevailing wind is from the SW.
What is the average temperature in Naperville year round?
The average temperature in Naperville over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -5°C.